Replaceable Battery: New and improved light-up knitted Christmas hat: The battery is hidden inside the hat and lasts up to 36 hours. The battery (2 * CR2032) can be replaced when the hat runs out. The Christmas hats for kids will keep shining next year! Merry Christmas! Soft and Warm: This unisex light-up winter hat is made of two layers of soft, stretchy acrylic fiber, making it very comfortable to wear. It covers the ears and keeps the head warm and cozy in cold weather, ideal for both indoors and outdoors. One Size Fits Most: Each light-up knitted winter hat measures 22 x 26 cm. This unisex LED hat is suitable for children, adults, men, and women. The knitted Christmas hat with LED lights has good elasticity and fits comfortably, neither too tight nor too loose. Warm Christmas Gifts: These unisex Christmas hats are perfect for Christmas gifts. They are an ideal present for children, adults, daughters, sons, fathers, mothers, boyfriends, girlfriends, relatives, and friends. This new Christmas hat also makes a cute photo prop. Easy to Turn On: The Christmas hat with LED lights has a hidden on/off switch in the seam. Simply press it to turn it on, and the light will flash. This Christmas hat with LED lights has 6 built-in lights in 3 colors: red, blue, and green.